OALib Journal期刊
ISSN: 2333-9721
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vti介质一阶准p波方程正演模拟及边界条件
Keywords: vti介质,准p波方程,正演,有限差分,交错网格,逆时偏移,pml吸收边界条件
Abstract:
?本文根据具有垂直对称轴的横向各向同性(vti)介质中的一阶准p波方程,构造了该方程在交错网格中求解的高阶有限差分格式,给出了其稳定性条件;重点研究了适用于该方程的完全匹配层(pml)吸收边界条件,在此基础上实现了vti介质中一阶准p波方程的正演模拟,得到了高精度的波场快照和合成记录,并采用叠前逆时深度偏移算法对复杂模型的合成记录进行偏移成像,得到了较好的成像效果。数值算例表明:准p波方程正演模拟能克服常规弹性波方程正演模拟的某些缺陷,便于研究各向异性介质中纵波的传播机理;叠前逆时深度偏移算法能够对复杂模型准确成像;通过对比分析各向同性与各向异性marmousi模型的合成记录以及两种偏移算法的成像结果,显示各向异性参数对波场特征(旅行时和振幅)会产生明显影响,在地震资料处理、反演和解释中不可忽略。
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